This is an analysis of the 3rd grade elementary school English open class conducted by the researcher. This class was taught in English, and COLT part 2 was used as an analysis tool. The target vocabulary was analyzed frequency by activity with the communication element of COLT 2. In this lesson, ‘Brown bear’ picture book was used as the material for the last integrated course to learn color. The picture book consisted of sentence pattern including color and animal vocabulary, and was used as a question and answer, a follow-up, and a worksheet material. The sentence pattern was composed repeatedly, and it was advantageous to learn the vocabulary and to learn the color with the favorite animal material. Because the sentence pattern was repeated, all of the target vocabulary was adequately presented beyond the minimum exposure frequency. However, Information gap elements were few because the composition of activities were limited to the picture book. Continuity of speech was simple with repetition and refinement. Therefore, it is necessary to incorporate various activities such as games, role-play, and riddle into the picture book to design the follow-up lessons regarding frequency of vocabulary exposure and communication patterns.